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A zombie computer is a computer attached to the Internet that has a hidden software program, a "backdoor". This backdoor allows the computer to be remote-controlled by others.
A Zombie Computer army can then be used for the purpose of Denial of Service attacks (DDoS).
A singe Zombie Computer can send unsolicited e-mails ( spamming).
Backdoors are often installed with spammed trojans or e-mail worms.